Portion of a display panel with a user interface



FIG. 1 is a front view of a portion of a display panel with a user interface showing features of my new design in which a user is in a logged-in state.

The broken lines including the showing of a portion of a display panel of a communications terminal surrounding the illustrated user interface are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a portion of a display panel with a user interface, as shown and described. 